How MyType should be defined to ensure that each item of my array is an array composed of item of the same type?

const array1: MyType = [["foo", "bar"], [42, 42], [true, false]]; // OK
const array2: MyType = [["foo", "bar"], [42, 42], [true, "false"]]; // Should throw a TS error

In my example I used string, number & boolean, but it could be anything.